US4796279A - Subrate preamble decoder for a high speed modem - Google Patents
Subrate preamble decoder for a high speed modem Download PDFInfo
- Publication number
- US4796279A US4796279A US07/068,733 US6873387A US4796279A US 4796279 A US4796279 A US 4796279A US 6873387 A US6873387 A US 6873387A US 4796279 A US4796279 A US 4796279A
- Authority
- US
- United States
- Prior art keywords
- preamble
- outputs
- output
- decoder
- modem
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
- H04L7/046—Speed or phase control by synchronisation signals using special codes as synchronising signal using a dotting sequence
Abstract
Description
A=-4+8j and
B=+4-8j=-A
sign [(-4) (-4)+(8) (8)]=Sign [80]=0
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/068,733 US4796279A (en) | 1984-12-11 | 1987-06-30 | Subrate preamble decoder for a high speed modem |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US68037784A | 1984-12-11 | 1984-12-11 | |
US07/068,733 US4796279A (en) | 1984-12-11 | 1987-06-30 | Subrate preamble decoder for a high speed modem |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US68037784A Continuation | 1984-12-11 | 1984-12-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4796279A true US4796279A (en) | 1989-01-03 |
Family
ID=26749304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/068,733 Expired - Lifetime US4796279A (en) | 1984-12-11 | 1987-06-30 | Subrate preamble decoder for a high speed modem |
Country Status (1)
Country | Link |
---|---|
US (1) | US4796279A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5127027A (en) * | 1989-11-09 | 1992-06-30 | Canon Kabushiki Kaisha | Training signal detecting apparatus |
US5150383A (en) * | 1990-03-08 | 1992-09-22 | Matushita Electric Industrial Co., Ltd. | Asynchronous quadrature demodulator |
EP1139629A2 (en) * | 2000-03-31 | 2001-10-04 | Matsushita Graphic Communication Systems, Inc. | Startup of V.34 communications |
US20020167949A1 (en) * | 1998-02-26 | 2002-11-14 | Gordon Bremer | Apparatus and method for asynchronous transfer mode (ATM) adaptive time domain duplex (ATDD) communication |
US20040136475A1 (en) * | 2002-12-26 | 2004-07-15 | Takehiko Kobayashi | Demodulation method and apparatus based on differential detection system for pi/4 shifted QPSK modulated wave |
US20050152404A1 (en) * | 1999-08-24 | 2005-07-14 | Paradyne Corporation | System and method for a robust preamble and transmission delimiting in a switched-carrier transceiver |
US20060114812A1 (en) * | 2002-11-26 | 2006-06-01 | Kwang-Soon Kim | Method and apparatus for embodying and synchronizing downlink signal in mobile communication system and method for searching cell using the same |
US7660344B2 (en) * | 2002-06-28 | 2010-02-09 | Bwa Technology, Inc. | AGC fine-tuning by the adaptive time domain equalizer |
US20190000110A1 (en) * | 2011-11-10 | 2019-01-03 | Taylor Commercial Foodservice Inc. | Dual valve injector assembly for dispensing a food product |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3978407A (en) * | 1975-07-23 | 1976-08-31 | Codex Corporation | Fast start-up adaptive equalizer communication system using two data transmission rates |
US3993956A (en) * | 1975-11-03 | 1976-11-23 | Motorola, Inc. | Digital detection system for differential phase shift keyed signals |
US4034305A (en) * | 1973-09-05 | 1977-07-05 | Nippon Electric Company, Ltd. | Demodulator for signals hybrid modulated by more and less significant digit signals in succession in each clock interval |
US4245345A (en) * | 1979-09-14 | 1981-01-13 | Bell Telephone Laboratories, Incorporated | Timing acquisition in voiceband data sets |
US4308618A (en) * | 1979-04-27 | 1981-12-29 | Compagnie Industrielle Des Telecommunications Cit-Alcatel | Method of compensating phase noise at the receiver end of a data transmission system |
-
1987
- 1987-06-30 US US07/068,733 patent/US4796279A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4034305A (en) * | 1973-09-05 | 1977-07-05 | Nippon Electric Company, Ltd. | Demodulator for signals hybrid modulated by more and less significant digit signals in succession in each clock interval |
US3978407A (en) * | 1975-07-23 | 1976-08-31 | Codex Corporation | Fast start-up adaptive equalizer communication system using two data transmission rates |
US3993956A (en) * | 1975-11-03 | 1976-11-23 | Motorola, Inc. | Digital detection system for differential phase shift keyed signals |
US4308618A (en) * | 1979-04-27 | 1981-12-29 | Compagnie Industrielle Des Telecommunications Cit-Alcatel | Method of compensating phase noise at the receiver end of a data transmission system |
US4245345A (en) * | 1979-09-14 | 1981-01-13 | Bell Telephone Laboratories, Incorporated | Timing acquisition in voiceband data sets |
Non-Patent Citations (2)
Title |
---|
"10.2 Digital Modulation", Communication Systems, Carlson, McGraw-Hill, 1975, pp. 389-391. |
10.2 Digital Modulation , Communication Systems, Carlson, McGraw Hill, 1975, pp. 389 391. * |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5127027A (en) * | 1989-11-09 | 1992-06-30 | Canon Kabushiki Kaisha | Training signal detecting apparatus |
US5150383A (en) * | 1990-03-08 | 1992-09-22 | Matushita Electric Industrial Co., Ltd. | Asynchronous quadrature demodulator |
US20020167949A1 (en) * | 1998-02-26 | 2002-11-14 | Gordon Bremer | Apparatus and method for asynchronous transfer mode (ATM) adaptive time domain duplex (ATDD) communication |
US20050152404A1 (en) * | 1999-08-24 | 2005-07-14 | Paradyne Corporation | System and method for a robust preamble and transmission delimiting in a switched-carrier transceiver |
EP1139629A2 (en) * | 2000-03-31 | 2001-10-04 | Matsushita Graphic Communication Systems, Inc. | Startup of V.34 communications |
US20020122475A1 (en) * | 2000-03-31 | 2002-09-05 | Matsushita Graphic Communication System, Inc. | Modem apparatus, image communication apparatus and communication control method |
EP1139629A3 (en) * | 2000-03-31 | 2004-07-14 | Panasonic Communications Co., Ltd. | Startup of V.34 communications |
US6954493B2 (en) | 2000-03-31 | 2005-10-11 | Panasonic Communications Co., Ltd. | Modem apparatus, image communication apparatus and communication control method |
US7660344B2 (en) * | 2002-06-28 | 2010-02-09 | Bwa Technology, Inc. | AGC fine-tuning by the adaptive time domain equalizer |
US20060114812A1 (en) * | 2002-11-26 | 2006-06-01 | Kwang-Soon Kim | Method and apparatus for embodying and synchronizing downlink signal in mobile communication system and method for searching cell using the same |
US7430193B2 (en) * | 2002-11-26 | 2008-09-30 | Electronics And Telecommunications Research Institute | Method and apparatus for embodying and synchronizing downlink signal in mobile communication system and method for searching cell using the same |
US7315587B2 (en) * | 2002-12-26 | 2008-01-01 | Hitachi Kokusai Electric Inc. | Demodulation method and apparatus based on differential detection system for π/4 shifted QPSK modulated wave |
US20040136475A1 (en) * | 2002-12-26 | 2004-07-15 | Takehiko Kobayashi | Demodulation method and apparatus based on differential detection system for pi/4 shifted QPSK modulated wave |
US20190000110A1 (en) * | 2011-11-10 | 2019-01-03 | Taylor Commercial Foodservice Inc. | Dual valve injector assembly for dispensing a food product |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5128964A (en) | Modulation method and apparatus for multicarrier data transmission | |
US3906347A (en) | Transversal equalizer for use in double sideband quadrature amplitude modulated system | |
US4320517A (en) | Method and device for effecting the initial adjustment of the clock in a synchronous data receiver | |
US4416015A (en) | Timing acquisition in voiceband data sets | |
US4028626A (en) | Digital data receiver with automatic timing recovery and control | |
US5799037A (en) | Receiver capable of demodulating multiple digital modulation formats | |
US3935535A (en) | Fast equalization acquisition for automatic adaptive digital modem | |
US3971996A (en) | Phase tracking network | |
EP0634856B1 (en) | Nonlinear coding for channels with intersymbol interference | |
US5311545A (en) | Modem for fading digital channels affected by multipath | |
AU629502B2 (en) | Carrier recovery system | |
US4355397A (en) | Full duplex communication system for voice grade channels | |
US4262360A (en) | Method and device for detecting a pseudo-random sequence of carrier phase changes of 0° and 180° in a data receiver | |
CA1152596A (en) | Equalizer sample loading in voiceband data sets | |
EP0650281A1 (en) | Adaptive precoding and preemphasis for trellis coded modulation systems | |
US5912920A (en) | Point-to multipoint digital communications system facilitating use of a reduced complexity receiver at each of the multipoint sites | |
US3524023A (en) | Band limited telephone line data communication system | |
WO1999005787B1 (en) | Adaptively equalized burst receiver and method for upstream broadband data | |
US3755738A (en) | Passband equalizer for phase-modulated data signals | |
US5440347A (en) | Method and apparatus for randomizing training sequences to minimize interference in digital transmissions | |
US4796279A (en) | Subrate preamble decoder for a high speed modem | |
AU649879B2 (en) | Decision-feedback equalizer capable of producing an equalized signal at a high speed without a remaining fading | |
US4253186A (en) | Method and device for detecting a pseudo-random sequence of two symbols in a data receiver employing double sideband-quadrature carrier modulation | |
US5648923A (en) | Nyquist filter for use in a joint VSB/QAM demodulator | |
EP0027314B1 (en) | Data receiver including means for forming line samples and method of operating such a data receiver |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
AS | Assignment |
Owner name: PARADYNE CORPORATION (FORMERLY KNOWN AS AT&T PARAD Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LUCENT TECHNOLOGIES, INC.;REEL/FRAME:008167/0408 Effective date: 19960731 |
|
AS | Assignment |
Owner name: BANKAMERICA BUSINESS CREDIT, INC., CALIFORNIA Free format text: SECURITY AGREEMENT;ASSIGNOR:PARADYNE CORPORATION;REEL/FRAME:008261/0384 Effective date: 19960731 |
|
AS | Assignment |
Owner name: PARADYNE CORPORATION, FLORIDA Free format text: DOCUMENT PREVIOUSLY RECORDED AT REEL 8732, FRAME 0779 CONMTAINED ERROR IN PROPERTY NUMBER 5796279. DOCUMENT RERECORDED TO CORRECT ERROR ON STATED REEL.;ASSIGNORS:BETTS, WILLIAM;MARTINEZ, KEN;REEL/FRAME:008869/0637;SIGNING DATES FROM 19970911 TO 19970922 |
|
FPAY | Fee payment |
Year of fee payment: 12 |
|
AS | Assignment |
Owner name: FOOTHILL CAPITAL CORPORATION, CALIFORNIA Free format text: SECURITY AGREEMENT;ASSIGNOR:PARADYNE CORPORATION;REEL/FRAME:012211/0350 Effective date: 20010716 |
|
AS | Assignment |
Owner name: PARADYNE CORPORATION, FLORIDA Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:WELLS FARGO FOOTHILL, INC. F/K/A FOOTHILL CAPITAL CORPORATION;REEL/FRAME:015603/0205 Effective date: 20041216 |
|
AS | Assignment |
Owner name: PARADYNE CORPORATION, FLORIDA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BANK OF AMERICA, N.A.;BANKAMERICA BUSINESS CREDIT, INC.;REEL/FRAME:015797/0535 Effective date: 20040722 |
|
AS | Assignment |
Owner name: PIRIN POCKET DATA LLC, NEVADA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PARADYNE CORPORATION;REEL/FRAME:017297/0726 Effective date: 20050202 |